Nut-lock.



PATENTED JUNE 9, 1908.

J". W. COOPER. NUT LOOK XEILIOATION FILED AUG. 24, 1907.

JOHN-w. oOoPEa oF BOSTON, MASSACHUSETTS.

NUT-LOCK.

Specification of Letters Patent.

' Patented Jun e9, 190 8,

V Application filed August 24, 1907. .Serial No. 389,991.

To all whom it may concern:

Be it known that I, JOHN W. COOPER, citizen of the United States,residing at Dorchester Station, Boston, in the county of Suffolk andState of Massachusetts, have invented certain new and usefulImprovements in Nut-Locks, of whicltthe following is a specification.

My invention aims to prevent the loosenlng'of nuts of railway, bridgeand like structural fastenings, also on all rolling stock of steam andelectric railroads where the loss of i a nut might causeaterribleaccident and on all carriages, automobiles, wagons and the like,whichare subject to vibration, thereby avoiding the vigilance necessaryto keepsuch fastenings in proper position when tightened, whileproviding 'a construction enabling of their repeated use. i

The invention relates to a fastening in which the rod or bolt has agroove lengthwise of its threaded portion and intersecting threadsthereof, and a nut ada )ted to screw upon the threaded portion' of therod or bolt and provided with a thin bendable portion which, after thenut has been tightened, is adapted to be pressed into the groove of therod or bolt and lock the nut thereon.

The invention consists of a projection formed on the outer side of thebendablelock portion of the nut to receive the blow expended to indentthe said bendable portion and cause it to enter the groove of the rod"or bolt.

-- The invention also consists of a recess of peculiar formationprovided in the outer face rod or bolt.

of the nutand having opposite walls forming guides to fix the positionof a punch and prevent lateral displacement thereof, the inner wall ofsaid recess being adjacent to the bolt opening and sufficiently thintobe readily bent andprovidedupon its outer side with the projection,which, when subjected to force, as by the delivery of'a blow thereon,causes the thin wall separating the recess from the bolt opening, to bepressed into the latter and enter a grooveinthe side of the Referring tothe drawings forming a part of the specifications: Figure l is aperspective viewofthethreaded portion of a rod or bolt, having a nutmounted thereon and embodying the invention. Fig. 2 is a front view ofthe nut and the rodor bolt upon which the same is mounted and secured,the

- dotted lines indicating the position of the punch employed forinsuring proper applica tion of theblow to the bendable lock portion ofthe nut. Fig: 3. is asectionalview of a corner portion of the nut ontheline x-m of Fig. 2, looking towards the bolt opening.

perspective view of in all the views of the drawings by the samereference characters.-

In the drawings, the numeral 1 indicates a rod or bolt or like fasteninghaving a threaded portion, and 2 a .nut cooperating therewith and havingan opening interiorlythreaded to match the screw threads of the rod orbolt 1.

One or more grooves 3 are formed in aside of the rod or bolt 1 andintersect the threads thereof, and are adapted to receive the-bendablelock portion of the nut 2 when the same has been made secure whentightened.

The nut 2 is'provided in its outer side or face with one or morerecesses 4, which are approximately of triangular form and graduallydeepen from the outer to the inner end, the inner. wall 5 beingcomparatively thin and bendable and separating the recess 4 from thebolt opening. The outer face ofthe wall 5 slopes with the result thatthe wall 5 gradually increases in thickness from its outer end towardsthe bottom of the recess, thereby providing ample metal to withstand thestrain incident to the turning of the nut when the structure to whichthe fastening is applied is subjected to vibration. The side walls 6 ofthe recess or recesses are angularly disposed, being preferably arrangedat a right angle so as to engage with the adjacent sides of a punchhaving a rectangular cross sectional outline so as to prevent sidedisplacement. thereof when delivering a blow thereon to indent or causethe wall 5 to enter the groove 3 of the fastening member 1. A rib orprojection 7 is formed medially of the outer side of the bendable wallor look portion 5, and its sides or faces outwardly converge to form anedge against which the innor end'of a punch or like tool S'may bear whenapplying the force of the blow to de fiect the bendable portion 5intothe groove 3 to lock the nut 2. The outer face of the nut is madeconvex and the-recess or recesses e are formed in the corners thereofwhere the greatest amount of metal is, located, thereby enabling arecess of maximum dimensions being provided Without materially weakenmgthe nut. The recess or recesses may be formed in any manner, either bystamping,

drop forging or casting, or in any way that may be found most economicaland advantageous in the manufacture of the nuts. The shapeof the-recess4 is such as to admit of its ready formation in any manner. The locationof the recess in a corner of the nut is articularly advantageous sincethe side wa ls 6 are of maximum length and give proper direction andfirm support to the punch 8 when delivering a blow on the outer endthereof to indent the bendable or look wall 5. The punch or tool 8 mayconsist of a bar of steel of square form in cross section, and saidpunch may be used with any one of its corners at either end fitted inthe recess Whose inner wall 5 comes opposite to a groove 3 in the rod orbolt 1 after the nut has been tightened, so that the delivery of a blowupon said punch will indent said wall and cause it to enter the grooveand thereby form a lock which will prevent casual loosening of the nutby vibration of the structure to which the fastening may be applied. Theprojection 7 insures application of the force at a central point withoutany especial care on the part of the workman, and any tool may beemployed so as to direct the force of the blow upon the projection, thepunch illustrated being preferable as the blow is equalized and sidedraft prevented because the fangularly disposed walls 6 of the recessserve as guides to hold the punch in proper position when raining a blowthereon. The projection or rib 7, in addition to insuring positive andcertain application of. the force ex ended to bend or dent the lockportion 5, also serves to stiffen and brace said lock portion, While thethin portions of the wall5 at opposite sides thereof, admit of the wallyielding under the force of the blow directed thereupon when bending thesame inward into the groove 3.

Having thus described the invention, what is claimed as new is:

1. In alock nut, the combination or a IOCt or bolt having a grooveintersecting its threaded portion, and a nut mounted upon the threadedportion of the rod'or bolt and having a recess in its outer face ofapproximately triangular form and gradually deep ening from its outer toits inner end the side walls of. the recess being arranged at arightangle to each other, and having the wall separating the recess andbolt opening comparatively thinand bendable and increased in width fromthe bottom of the recess to- Wards the outer open side thereof and hav-Ying a rib or projection upon the side of said bendable wall facing thevsaid recessand adapted to brace the said wall and to insure v threadedopening to receive the said rod orbolt, and having triangular shapedrecesses in its outer side opposite the corners, each of said recessesbeing separated from the threaded bolt opening by a bendable wallprovided with a centrally disposed tapered rib on the side facing therecess to brace said wall and receive the blow expended to. 're'ss thesaid bendable wall into a groove 0 .the bolt or rod, and having the sidewalls of the recess arranged relatively at a right angle to engage withadjacent sides of a square punch to direct the same and to preventslipping and enable either of the four corners-of the punch being used.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN W. COOPER. [L. s.] Witnesses:

V. B. HILLYARD, W. N. WoonsoN.

